How about we get the federal prosecutors to actually charge and bring to court all the illegal weapons charges to begin with?
How many convicted felons that use a firearm to commit another crime actually get charged for the federal offense? IMHO, not many.

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NRA Chief Range Safety Officer, Home Firearms Safety, Pistol and Rifle Instructor"There are three classes of people: those who see, those who see when they are shown, those who do not see."
Leonardo da Vinci